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In most Unix-like systems, most of the machine code that makes up the dynamic linker is actually an external executable that the operating system kernel loads and executes first in a process address space newly constructed as a result of calling exec or posix_spawn functions. At link time, the path of the dynamic linker that should be used is ...
A linker script may be passed to GNU ld to exercise fine grain control of the linking process. [6] Two versions of ld are provided in binutils: the traditional GNU ld based on bfd, and a streamlined ELF-only version called gold. The LLVM project's linker, lld, is designed to be drop-in compatible, [7] and may be used directly with the GNU ...
Dynamic loading is a mechanism by which a computer program can, at run time, load a library (or other binary) into memory, retrieve the addresses of functions and variables contained in the library, execute those functions or access those variables, and unload the library from memory.
Dynamic: C: 1993-06-01 GPL: 4 herbstluftwm: Dynamic: C++: 2011-10-02 0.9.5 2022-07-30 BSD-2-clause: i3: Dynamic: C: 2009-03-15 4.24 [19] 2024-11-06 BSD-3-clause: 3 IceWM: Stacking: C++: 1997 3.7.1 [20] 2025-02-27 LGPL-2.0-only: 4.5 Ion: Tiling: C, Lua: 2000 Final 2009-01-10 LGPL-2.1-only [a] JWM: Stacking: C: 2003 2.4.5 [21] 2024-10-05 MIT: 3 ...
Examples of file formats use for both dynamic library and executable files include ELF, Mach-O, and PE. A dynamic library is called by different names in different contexts. In Windows and OS/2 the technology is called dynamic-link library. In Unix-like user space, it's called dynamic shared object (DSO), or usually just shared object (SO).
Relocation is the process of assigning load addresses for position-dependent code and data of a program and adjusting the code and data to reflect the assigned addresses. [1] [2] Prior to the advent of multiprocess systems, and still in many embedded systems, the addresses for objects are absolute starting at a known location, often zero.
The object file is input for the dynamic linker and can't be statically link edited again. 1<<3: 0000_0000_0000_0000_0000_0000_0000_1000: The object file's undefined references are bound by the dynamic linker when loaded. 1<<4: 0000_0000_0000_0000_0000_0000_0001_0000: The file has its dynamic undefined references prebound. 1<<5
For example, FreeBSD kernel modules compiled against kernel version 6.0 will work without recompilation on any other FreeBSD 6.x version, e.g. 6.4. However, they are not compatible with other major versions and must be recompiled for use with FreeBSD 7.x, as API and ABI compatibility is maintained only within a branch.